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MOTOR VEHICLE CENSUS
3 Vehicles on register are defined as those vehicles registered at the date of the census, or had registration expire less than one month before that date.
4 Motor vehicle registration statistics are derived from data made available by various state and territory motor vehicle registration authorities and reflect the information as recorded in registration documents.
5 Considerable effort has been made in recent years, both by motor vehicle registration authorities and the Australian Bureau of Statistics (ABS), to improve data quality through the introduction of improved processing and classification systems, and the incorporation of additional internal checking based on make and model. While these have improved data accuracy, there remains some variation in the reporting from different state and territory registries and hence care should still be taken when comparing data across jurisdictions.
6 For vehicles manufactured during or after 1990, the statistics in this publication are based on procedures using the Vehicle Identification Number (VIN), adopted by state and territory motor vehicle registration authorities. The VIN system allows accurate identification of the make and model of a vehicle, which can then be used to better identify the vehicle type. Vehicles manufactured earlier than 1990 generally do not have a VIN.
7 The estimated proportion of motor vehicles, excluding motor cycles taken off the register since the previous MVC is referred to as the attrition rate. The attrition rates in the following table have been calculated using new motor vehicle sales data.
ESTIMATED ATTRITION BY STATE (a), State/territory, Census years
8 The Motor Vehicle Census includes all vehicles registered with a state, territory or other government motor vehicle registry for unrestricted use on public roads with the following exceptions:
9 The ABS uses geographic concordances to enable the conversion of data from one type of geographic region to another. These geographic concordances are generally used to convert data for 'non-standard areas' to data for standard areas used by the ABS.
10 The only geographic data available from the MVC are postcode of owner and state of registration. Consequently, conversion factors have been used to concord postcode estimates to estimates for statistical local areas (SLA). SLA estimates are then aggregated to form statistical divisions (SD). The concordances were calculated according to the SLA boundaries as at 1 July 2002 as explained in the Detailed Main Structure of the Australian Standard Geographical Classification (ASGC), 2002, (cat. no. 1216.0).
11 The geographic concordances used for this MVC were based on the distribution of the estimated resident population (ERP) across Australia. For the purposes of this publication, it is assumed that motor vehicles are distributed between SLAs in the same manner as the ERP.
12 When analysing the data the following limitations of the concordance methodology need to be taken into account:
13 While care was taken in producing concordances, the ABS will not guarantee the accuracy of concorded data.
14 Users may also wish to refer to the following publications and products which contain information relating to motor vehicles in Australia:
ABS DATA AVAILABLE ON REQUEST
15 As well as the statistics included in this publication, the ABS has other relevant data available on request. Inquiries should be made to the National Information and Referral Service on 1300 135 070.
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